-Mohs Scale : 2.5-4.5. Crinoid fossil can scratch easily, take precautions to avoid scratches, and breaks.
-Crinoids, also know as "sea lilies", fossils are the preserved marine invertebrates related to starfish, and sea urchins from up to 340-million years ago. Crinoids still exist today but are less common and much smaller than their predecessors.
- Crinoid Fossils is great for promoting physical well-ness, historical insight, grounding, and stability.
